I'm very sorry for asking, I'm used in designing Datasets from the DataSet Designer then I tried to shift to making codes for them manually, I got this example from MSDN. How will I use or call the adapter from this function
If I want to use the SelectCommand or the other commands, what should I write in my code
for example from Form1_Load, I want to use the SelectCommand.
Thanks in advance.
public static SqlDataAdapter CreateCustomerAdapter(
SqlConnection connection)
{
SqlDataAdapter adapter = new SqlDataAdapter();
// Create the SelectCommand.
SqlCommand command = new SqlCommand("SELECT * FROM Customers " +
"WHERE Country = @Country AND City = @City", connection);
// Add the parameters for the SelectCommand.
command.Parameters.Add("@Country", SqlDbType.NVarChar, 15);
command.Parameters.Add("@City", SqlDbType.NVarChar, 15);
adapter.SelectCommand = command;
// Create the InsertCommand.
command = new SqlCommand(
"INSERT INTO Customers (CustomerID, CompanyName) " +
"VALUES (@CustomerID, @CompanyName)", connection);
// Add the parameters for the InsertCommand.
command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID");
command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName");
adapter.InsertCommand = command;
// Create the UpdateCommand.
command = new SqlCommand(
"UPDATE Customers SET CustomerID = @CustomerID, CompanyName = @CompanyName " +
"WHERE CustomerID = @oldCustomerID", connection);
// Add the parameters for the UpdateCommand.
command.Parameters.Add("@CustomerID", SqlDbType.NChar, 5, "CustomerID");
command.Parameters.Add("@CompanyName", SqlDbType.NVarChar, 40, "CompanyName");
SqlParameter parameter = command.Parameters.Add(
"@oldCustomerID", SqlDbType.NChar, 5, "CustomerID");
parameter.SourceVersion = DataRowVersion.Original;
adapter.UpdateCommand = command;
// Create the DeleteCommand.
command = new SqlCommand(
"DELETE FROM Customers WHERE CustomerID = @CustomerID", connection);
// Add the parameters for the DeleteCommand.
parameter = command.Parameters.Add(
"@CustomerID", SqlDbType.NChar, 5, "CustomerID");
parameter.SourceVersion = DataRowVersion.Original;
adapter.DeleteCommand = command;
return adapter;
}
How do I call this function?
amr osama
SqlDataAdapter adapter = new SqlDataAdapter();
DataSet result = new DataSet();
string query = "DELETE * FROM Table1";
using(SqlConnection dbconn = new SqlConnection("myconnectionstring"))
using(SqlCommand command = dbconn.CreateCommand())
{
command.CommandText = query;
try
{
dbconn.Open();
int effected = command.ExecuteNonQuery();
MessageBox.Show( this, "Delete command executed succesfully and effected " + effected + " rows." );
}
catch(SqlException caught)
{
MessageBox.Show( this, "Error while executing delete command.\r\n\r\nDetails:\r\n" + caught.ToString() );
}
finally
{
dbconn.Close();
}
}
MarcHoeppnerNeoGeo
Carl B.
rkpetersen
Richard Tkachuk
As PJ. van de Sande says right, you should use the SqlDataAdapter.Fill() method.
The code for the function you supplied should be like:
DataSet result = new DataSet();
SqlDataAdapter adapter = CreateCustomerAdapter(connection);
adapter.Fill(result);
Owen T. Soroke
In the Load event of the Form class you put some code like this:
SqlDataAdapter adapter = new SqlDataAdapter();
DataSet result = new DataSet();
string query = "SELECT * FROM Table1";
using(SqlConnection dbconn = new SqlConnection("myconnectionstring"))
using(SqlCommand command = dbconn.CreateCommand())
{
command.CommandText = query;
adapter.SelectCommand = command;
adapter.Fill( result );
}
// TODO: Use the filled 'result' here.